Politecnico di Bari, DEE, Power Electronics Research Group Marco Liserre [email protected] Power Electronics Research Group in Bari Marco Liserre Mercator

Marco Liserre [email protected]

Politecnico di Bari,Politecnico di Bari, DEE, Power Electronics Research Group DEE, Power Electronics Research Group

Power Electronics Research Group Power Electronics Research Group in Bariin Bari

Marco LiserreMercator Professor at Christian-Albrechts University of Kiel

Lehrstuhl für Leistungselektronik und Elektrische Antriebe

Dipartimento di Elettrotecnica ed ElettronicaPolitecnico di Bari

Bari, [email protected]



Il Politecnico di BariIl Politecnico di Bari



Politecnico di Bari

Bari

Foggia Architecture faculty1500 students

Engineering Faculty 10000 students

De' remi facemmo aliDante Alighieri

Divina CommediaCanto XXVI, verso 125

+ +=

10 Departments

Taranto



Department of Electric and Department of Electric and Electronic EngineeringElectronic Engineering



Department of Electric and Electronic EngineeringDepartment of Electric and Electronic Engineering

Head: Prof. B. Turchiano

80 professors

40 PhD students

9 scientific groups (the Power Electronic Research group is part of ING-IND/32 Converter, Electrical Machines and Drives)

27 laboratories



The Power Electronic The Power Electronic Research Group Research Group



Power Electronic Research Group Power Electronic Research Group

Researchers

Professors 2 PhD students 3 Post-doc reaserchers 2 Assistant reasercher 1

Research activities

A. Multilevel converters: modulation and control

B. Three-phase active rectifiers

C. Power quality assessment criteria and active compensation systems

D. Power converters for distributed power generation systems



Power Electronic Research Group Power Electronic Research Group Collaborations

L’Aquila UniversityAalborg University (Denmark) Nottingham University (UK)Christian-Albrechts University of Kiel (Germany)Cantabria University (Spain)Alcalá University (Spain)Technical University of Catalunya (Spain)

Publications 2000-2008

Journal papers 30Conference papers 120Book chapters 4PhD thesis 6

Main research funds 2000-2008Cluster 13 P8 EMC 1.174.785 €AnsaldoBreda Spa Automatic C code generation 100.000 €Jonica Impianti power converter for WT 30.000 €

in cooperation with other groupsPON Industrial automation 635.890 €Marie Curie PhD fellowship 230.287 € Regional reaserch project on PV Reactive power control with PV systems 50.000 €



Research activitiesResearch activities



A.A. Multilevel converters: modulation and controlMultilevel converters: modulation and control

PI-based and passivity-based control of H-Bridges multilevel converters

Back-to-back drives for traction systems

Multilevel modulations and their implementation on FPGA systems



B.B. Three-phase active rectifiersThree-phase active rectifiers

LCL-filter design and passive/active damping of control loops

Back-to-back drive with reduced energy storage

Fuzzy-sensorless control for low-cost microcontrollers



C.C. Power quality assessment criteria and active compensation systems Power quality assessment criteria and active compensation systems

New power quality assessment criteria for non-linear loads

Predictive, fuzzy and fuzzy-predictive controls of active filters

Optimal tuning of active power filters via genetic algorithms and Nelder-Mead method



D.D. Power converters for distributed power generation systems Power converters for distributed power generation systems

PV and WT simulators

PV converters

Anti-islanding methods

Control of a PMSG-based wind turbine without speed sensors

Power quality improvements through DPGS

Projects involving companies:

• a regional research project in the field of PV-systems: reactive power control has been tested (Rienergia company involved)

• a project with Jonica Impianti company to build the converter for a small WT



Photovoltaic system emulator

Aims: to create a realistic test bench for

photovoltaic inverter To predict MPPT and other control

algorithms behavior when the inverter is installed

Items: 2 software: Sun simulator and Solar

panel simulator

Hardware: Dc source

simulator of temperature and

irradiation

simulator of photovoltaic panel

MPPT

Photovoltaic system emulator

dc source

inverter

grid

SUN SIMULATORSOLAR PANEL SIMULATOR

System under test





Hardware of the photovoltaic system emulator

load

inverter

Inverter control

Meas.

filter

Phtovoltaic system

emulator





only changing the parameters of the controllers

only changing the parameters of the controllers

Wind emulator

It controls a motor to act as the blades and gearbox of a wind turbine. The motor is directly coupled to the generator and power converter under test

0 0.005 0.01 0.015 0.02 0.025 0.03 0.035 0.04-25

-20

-15

-10

-5

0

5

10

15

20

25

Tempo [s]V

a [V

olt]

, ia

[A

mpe

re]

Confronto tensione-correntecon Velocità del vento di 12 m/s

Va/10

ia

0 20 40 60 80 100 120 140 160 180 2000

1000

2000

3000

4000

5000

6000CARATTERISTICA DI CONTROLLO

Velocità rotore [rpm]

Co

pp

ia [N

*m]

12 m/s

14 m/s

9 m/s

8 m/s

7 m/s6 m/s5 m/s4 m/s

10 m/s



PV converters: step-up inverter

The system consists of three dc/dc boost converters with a common point and operating as a three-phase inverter with intrinsic step-up capability. The converter obtained can invert, amplify and, where possible, regenerate bidirectional power sources such as fuel-cells, small gas turbines and photovoltaic arrays. There are two main advantages to the system: the use of only six IGBTs and small passive elements, and the fact that it does not need reverse voltage blocking capability.



PV converters: transformerless converter

The research has been focused on transformerless photovoltaic inverter topologies for three-phase grid connection with the main focus on the safety issues that result from the lack of galvanic isolation. A common-mode model, valid at frequencies lower than 50kHz, is adopted to study the leakage current paths.

Gate driver Sensors & Protections

DSP

LCL filterNPCGrid

N

L

FilterFilterBoost without trafo FB inverterFilterPV Array

S5

S1 S3

S2 S4

D1 D3

D2 D4

D5

VPE Leakage circulating current

Research developed in cooperation with a PhD student working for “Electrical Energy Conversion and Condition”, European Project “MARIE CURIE: Early Stage Training Fellowships (EST)”, University of Nottingham. Local coordinator Prof. A. Dell’Aquila (€ 230.287).



Anti-islanding algorithms

The research has been started with a deep simulation and experimental comparison of the passive and active methods used for islanding detection. Then the research has been carried out on Kalman-filter-based and wavelet-based methods for islanding detection

The research developed in cooperation with a visiting reasercher from Spain has originated the following project “Algoritmos para la detección de la condición de isla eléctrica en inversores aplicados a sistemas de generación fotovoltaica distribuida de acuerdo con la normativa europea” Coordinatore Víctor M. Moreno Sáiz, Università della Cantabria (50.000 €)



Control of a PMSG-based wind turbine without speed sensors

The research has been started with a deep simulation comparison of the diode-bridge based and back-to-back power converters. Then it has been focused on the speed-sensorless control of generator inverter



Power quality improvements through DPGS

Also low power PV systems can be designed to improve the power quality. They can provide grid voltage support and compensation of harmonic distortion at the point of common coupling (PCC)

Iload

Ic’

E Ig

PIRepetitive

control

Ic’

+

- -

+

Iref

Vc’

grid

Vref

Vpeak

mpptd+ + MPPTalgorithm

PV

Ipv

Upv

PLL

Vg



Measures P2 Q2 V2

Measu

res P

1

Q1

V1

Control signal

MT/bt

Control system

Q2

Regional research project in the field of PV-systems



AC/DC DC/AC

GENERATORE

RETE ELETTRICA

DSP

Interf DSP1

LCL filter

misuratensione

misuracorrente

MOTORE DIIMBARDATA

TURBINASKIIP 132GDL120-4DU

misuratensione

misuracorrente

DSP

Interf DSP 2

SKIIP 132GD120-3DU

misuratensione

IRAMS10UP60B

misuratensione

Interf chopper

Interf inverter

Interf raddrizzatore

Industrial project to build the converter for a small WT



Laboratory equipment Laboratory equipment



dSpace boards 8

Danfoss inverters with Aalborg cards

10

Acquistion boards for voltage and currents 20

National Instruments acquistion boards 2

oscilloscopes 7

Microcontrollers boards 6

5 kW induction motor drives 4

2 kW PMSM drives 2

9 kVA ac power supplies 1

1.5 kVA dc power supplies 2

EMI receiver 1

Laboratory EquipmentLaboratory Equipment



Laboratory EquipmentLaboratory Equipment

dSpacedSpace dsp Texasdsp Texas



Laboratory equipmentLaboratory equipment



You are welcome to visit us !You are welcome to visit us !

Visiting Msc Visiting Msc students from students from NetherlandsNetherlands

Visiting PhD Visiting PhD student from student from

DenmarkDenmark

Many other Many other have visited us have visited us

from other from other European European university university



BariBari

TraniTraniCastel del Castel del montemonte



Few words about the speakerFew words about the speaker

Marco Liserre received the MSc and PhD degree in Electrical Engineering from the Polytechnic of Bari, respectively in 1998 and 2002. From January 2004 he is an assistant professor in the same university teaching courses of power electronics, industrial electronics and electrical machines. Recently his research interests are focused on industrial electronics applications to distributed power generation systems based on renewable energies. He has co-authored 116 technical papers, 28 of them in international peer-reviewed journals and 3 chapters of a book. These works have received more than 500 citations.

He has been a visiting Professor at Aalborg University (Denmark), Alcala de Henares (Spain) and he is currently Mercator Professor at Christian-Albrechts University of Kiel (Germany). He has been giving lectures in different universities and tutorials for the following conferences PESC 2008, ISIE 2008, EPE 2007, IECON 2006, ISIE 2006 and IECON 2005. From three years Marco Liserre has been teaching, with Prof. Remus Teodorescu and with Prof. Pedro Rodriguez, the Industrial PhD Course “Power Electronics for Renewable Energy Systems – in theory and practice” at Aalborg University (Denmark).Marco Liserre is a senior member of the IEEE and of the following societies: Industrial Electronics Society, Power Electronics Society and Industry Applications Society. He has served as reviewer for international conferences and journals. Within the IES he has been active as responsible of student activities, AdCom member, editor of the newsletter, responsible of region 8 membership activities. He has been involved in IEEE conferences organization in different capacities. He is an Associate Editor of the IEEE Transactions on Industrial Electronics. He is Founder and Editor-in-Chief of the IEEE Industrial Electronics Magazine. He is Founder and Chairman of the Technical Committee on Renewable Energy Systems of the IEEE Industrial Electronics Society.



“Industrial/Ph.D. Course in Power Electronics for Renewable Energy Systems – in theory and practice”

R. Teodorescu, P. Rodriguez, M. Liserre, J. M. Guerrero

Aalborg University, Denmark

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Politecnico di Bari, DEE, Power Electronics Research Group Marco Liserre [email protected] Power Electronics Research Group in Bari Marco Liserre Mercator